handle spring gone?

hey. i'm new to the sport. i've been playing for fun for about a year, but this is my first time playing for a team (my school). i have a wilson pro staff lite 6.9 si and the plastic thing on the bottom of the handle fell off a while ago, and according to some of my friends, the spring in the handle also did. i didn't even know that the handle had a spring in it! well anyways, there are two metal "cylinder things" in the handle that are noticeable and seem to run up all the way through the handle. are my friends correct and the handle spring really did fall out? and if so, is it possible to replace it? if they are wrong, where can i get another "cap" for the bottom of my racquet handle?